Blitzball has already been hinted at, but I know I'm personally hoping for the likes of Triple Triad, Tetra Master, and the Coliseum
These Synchro Monsters have varied Levels from 5 to 8, allowing the archetype to be adaptable and use any monster with a Level between 2 and 5 alongside "Junk Synchron" as Synchro Material for their Synchro Summons
Aether Meltdown, Imprisoned in the Moon, and Unquenchable Thirst look to be inferior to Spontaneous Mutation, although admittedly I havent played with any of the three yet personally
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(Rule) Name: Also treated as having [Mamemon]/[Tyrannomon]
Rayquaza also has a single attack called Max Burst, which requires at least 1 Fire-type Energy and 1 Electric-type Energy to use